Used to paint concrete, seal it and makes it waterproof.
Concrete-based ponds need the final render sealing to stop the water getting in and lime leaking out. G4 has been long-established as the market leader for this task. When using the black paint, the first two coats must be G4 Clear. This is because the G4 Clear provides the maximum non-porous seal and adhesion. A further two coats of G4 Black can now be added. This is a total of 410g per square metre clear and 400g sqm black.